Meta

Blogroll

EEWEb Europe is an online community for electronics engineering and electrical engineering. It is also an electronic forum and it offers electrical and electronic design articles and resources. The website language is German.

In this video I’m doing a product review and teardown of the Mastech MS6612 Digital Light Meter. I am also taking a look at a typical 9V battery datasheet and make an estimate on the usage hours that I’m going to get for this meter.

In this video I do a quick review of a 5 inch LCD TFT Monitor With 2 CH Analog Input. This module was sent to me free of charge for review by gearbest.com. The module is based on the MST703 video decoder and if you want to know more about this chip check it’s datasheet in the links from the video description.

Today we’re going to be looking at some laptop batteries, we’re going to take them apart and attempt to salvage some lithium cells to use in other projects.

I have these two identical batteries coming from a Fujitsu Siemens laptop and they’re both dead. These batteries usually fail in one of two modes, they either have a failed electronics board and in this case they don’t communicate with the laptop motherboard anymore for correct management or they have one or more lithium cells failed and they don’t reach their nominal voltage anymore.I believe these two are in the second category where one or more cells have failed and they don’t reach their nominal voltage anymore.

The assembly of this LED persistence of vision kit started well but it soon went bad because of poor design and lack of instructions. There is no documentation on how to assemble the mechanical parts so you have to figure that out yourself. There is no mention or pictures of how the LED’s should be soldered and to my surprise they need to be soldered on the edge of the PCB. There is no information on how to load the firmware or custom text patterns. After some research I did manage to find a chinese app which is supposed to work with this kit but I had no success in writing/uploading anything to the microcontroller.

I even spent an hour or so with google translate and, translated to english most of the buttons and messages in the app.

At this point I’m not sure if my problem is in the hardware(unlikely) or if I need to program the microcontroller, or if the microcontroller has some firmware and I just need to upload a custom display pattern using that chinese app.

Too much time & effort has been wasted so I’m not going to follow this anymore. My recommendation: don’t buy this kit unless you have too much free time and you enjoy solving complicated (chinese) problems.

This is a product unboxing of the Xiaomi Yi. A few words about the specs of this camera: It is using a Sony CMOS 16MP sensor with 155 degree wide angle lens, it’s capable of 1080p @ 60fps, 720p @ 120fps, come withs BT 4.0, Wifi. All this made possible by the Ambarella A7LS SoC.